68 lines
2.5 KiB
Haskell
68 lines
2.5 KiB
Haskell
-- Initially from
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-- https://github.com/MasseR/xmonad-masser/blob/master/src/XMonad/Password.hs
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module Password (passGeneratePrompt, passPrompt) where
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import Control.Monad.Trans (liftIO)
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import Data.Function (on)
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import Data.List (foldl', scanl', sort, sortBy)
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import System.Directory (getHomeDirectory)
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import System.FilePath.Posix (dropExtension, takeExtension, (</>))
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import System.Posix.Env (getEnv)
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import XMonad.Core
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import XMonad.Prompt
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import XMonad.Util.Run (runProcessWithInput)
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newtype Pass = Pass { passLabel :: String }
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-- Rosetta code levenshtein
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levenshtein :: String -> String -> Int
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levenshtein s1 s2 = last $ foldl' transform [0..length s1] s2
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where
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transform [] _ = []
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transform ns@(n:ns1) c = scanl' calc (n+1) $ zip3 s1 ns ns1
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where
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calc z (c1, x, y) = minimum [y+1, z+1, x + (fromEnum (c1 /= c) * 2)]
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instance XPrompt Pass where
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showXPrompt p = passLabel p <> ": "
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commandToComplete _ = id
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nextCompletion _ = getNextCompletion
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passGeneratePrompt :: XPConfig -> X ()
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passGeneratePrompt _ = return () -- Not implemented
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passPrompt :: XPConfig -> X ()
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passPrompt = mkPassPrompt "Select password" selectPassword
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mkPassPrompt :: String -> (String -> X ()) -> XPConfig -> X ()
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mkPassPrompt label f conf = do
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-- I'm just sorting here, but could use some kind of fuzzy matching instead,
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-- but it requires a bit more effort
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passwords <- sort <$> liftIO getPasswords
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mkXPrompt (Pass label) conf (passComplFun passwords) f
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where
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getPasswords = do
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passwordStoreDir <- (</> "pass") <$> getHomeDirectory
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files <- runProcessWithInput "find"
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[ passwordStoreDir, "-type", "f", "-name", "*.gpg", "-printf"
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, "%p\n"] []
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return . lines $ files
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-- | Find all entries (`allPasses`) matching `input`
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passComplFun :: [String] -> String -> IO [String]
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passComplFun allPasses input = pure $
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sortBy (compare `on` levenshtein input)
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. take 10
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. filter (consumes input)
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$ allPasses
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where
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consumes [] _ = True -- everything consumed
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consumes (_:_) [] = False -- all not consumed
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consumes (a:xs) (a':ys) | a == a' = consumes xs ys
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| otherwise = consumes (a:xs) ys
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selectPassword :: String -> X ()
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selectPassword pass = spawn $ "gpg --decrypt " ++ pass ++ " | copy"
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-- “copy” comes with the xmonad module in the nix configuration
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